She said: "It was when I was 7 or 8. I wanted to be Emma Bunton. She was so, so cute.

"I had a friend called Ellie and we would fight because she had blonde hair.

"So she thought she could get to be Emma and I said my name was Emma. This went on for months."

In pictures - Emma Watson's career:Watson currently stars in Sofia Coppola's The Bling Ring as a California teen who robs the homes of celebrities including Paris Hilton, Rachel Bilson and Lindsay Lohan.

More From Cosmopolitan

The movie opens in UK cinemas today (July 5) and is showing in the US now.